The departures of Mark Longabaugh, Julian Mulvey and Tad Devine, who run the consulting firm Devine Mulvey Longabaugh (DML), were first reported in a tweet by The New York Times reporter Jonathan Martin on Tuesday.

A spokesman for Sanders confirmed the exits to The Hill.

Sanders’s campaign manager, Faiz Shakir, said in a statement that “the campaign appreciates all the good work DML had done and wishes them well.”

Devine, Mulvey and Longabaugh were widely considered the driving forces behind Sanders’s media strategy during his insurgent bid for the White House in 2016.